Portable rammer



No. 624,458. l Patented May 9, I899. J. c. CHAMP.

PORTABLE HAMMER.

(Application filed May 12, 1898.; (No Model.)

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JOSEPH C. CRAMP, OF PHILADELPHIA, PENNSYLVANIA.

PORTABLE RAM M ER.

SPECIFICATION forming part of Letters Patent No. 624,458, dated May 9, 1899.

Application filed May 12,1898. Serial No. 680,467. (Nomodeh) chine which I term a Portable Hammer, of.

which the following is a specification.

Under the existing process of preparing molds for castings in foundry-work the sand or earth of which the mold is composed is packed or rammed up, as the operation is called, by hand labor. To prevent the molten metal from spreading beyond the desired limits of the mold or straining when it is poured into the mold, it is essential that the mold should be both closely and uniformly rammed. In ramming by hand there is a Wide variation in the force of the blows delivered, and in consequence some layers or portions of the mold will be closely and some loosely rammed. When the metal is poured into the mold, the loosely-rammed portions yield under the pressure and the casting alters its proper shape or strains. This necessitates the subsequent turning 0d of the superfluous metal at a loss of time, labor, and material.

The object of my invention is to perform the operation of ramming up moldsfor casting and similar work by means of a portable rammer, operated by steam or compressed air, suitably suspended over the moldingpit and directed by hand. To accomplish this object, my invention involves the features of construction and combination or arrangement of devices hereinafter described and claim ed, reference being made to the accompanying drawings, in which- Figure 1 is a vertical sect-ion of the portable rammer exclusive of the rods joining the two cylinders. Fig. 2 is a detail view, in side elevation, of the trip which governs the valve. Fig. 3 is a view in side elevation of the entire portable ram mer exclusive of the flexible supply-pipe and its connections. Fig. is a view of the means for suspending the rammer.

In Fig. 1,A A are inverted cylinders, disposed vertically one above the other, in which the piston-rod B operates by means of the trunk-pistons C C. D D are exhaust-ports in the sides of the cylinders A A.

sjteam-ports in the sides of the trunk-pistons C. with the cylinders A A. G is an ordinary three-way or Corliss valve communicating with the branch pipe F. Communicating with the valve G is the pipe J to which is detachably coupled the flexible pipe V, as shown at U, for conveying steam or compressed air to the cylinders of the rammer. The trip I, attached to the piston-rod B,engages the lever H of the valve G, and thereby operates automatically the three-way or Corliss valve G. This trip I is shown in detail in side elevation at Fig. 2. The rammer E is attached to the lower end of the piston-rod B.

In Fig. 3 the rods K K K" are shown which connect the cylinders A A. S S are handles attached to the sides of the cylinder A, L is a ring attached to the upper end of the cylinder A. 3

The operation of the portable rammer is as follows: Steam or compressed air being supplied through the flexible hose or pipe V, Fig. 1, is alternately admitted by the valve G to the cylinders A and A, Fig. 1. At the instant that the trunk-piston rises and the steam or air exhausts through the steam-port D the valve G cuts ofi from the cylinder A and opens to the cylinder A. The trunk-piston C then descends and exhausts in a similar manner through the steam-port D. The trip I, rising and falling with the stroke of the piston-rod B, engages the end of the lever H, which in turn automatically opens and closes the valve G, admitting steam or air alternately to the cylinders A and A. The pistonrod B, with its rammer E, thus rises and falls Witha stroke uniform in rapidity and force. The rapidity of the blows can be increased by increasing the pressureof the steam or air; A workman stands in the molding-pit and directs the blows of the rammer by means of the handles S S, Fig. 3, which are attached to the sides of the cylinder A at a convenient height.

The apparatus is flexibly suspended by means F is a branch pipe communicating the ring orstrap attached to the'upper end of rigidly connected, a piston-rod with upper and lower pistons working in said upper and -lower cylinders, a rammer attached to the lower end of said piston-rod, a valve automatically governed by the piston-rod and admitting power alternately to said upper and lower pistons, a flexible pipe communicating with said valve, means such as the handles S S for guiding and directing the operation of said ramming device, and means for flexibly suspending said ramming device, substantially as described.

2; In combination, an inverted upper and lower cylinder rigidly connected, a piston-rod with upper and lower single-acting pistonheads working vertically in said upper and lower cylinders, a rammer attached to the lower end of said piston-rod, and valved connections for supplying power alternately to said upper and lower piston-heads, controlled by the piston-rod; means for flexibly suspending said device, and means such as handles S S for conveniently directing the vertical position of the same, substantially as described.

ated ramming device, a piston-rod-working vertically in an upper and a lower cylinder, devices rigidly connecting said cylinders, a

rammer attached to the lower end of said piston-rod, a branch pipe communicating with said upper and lower cylinders, a valve mounted in and controlling said branch pipe,

a lever attached to said valve, a trip attached to said piston-rod and adapted to actuate the valve, and a flexible pipe communicating with said valve, substantially as described and for the purposes set forth.

4. In combination, an inverted lower cylinder, an inverted upper cylinder arranged vertically above said lower cylinder and rigidly connected therewith, a piston-rod and trunkpistons operating vertically in said cylinders, a rammer attached to the lower end of said piston rod, a branch pipe communicating with'said'upper and lower cylinders, a Valve communicating with said branch pipe, a lever attached to said valve, a trip attached to said piston-rod between said upper and lower cylinders engaging said lever, and a flexible pipe communicating with said valve, substantially as described and for the purposes set forth.

JOSEPH o. cRAMP.

Witnesses:

EDWIN C. NEVIN, H. BovEE SCHERMERHORN, 

